High Pressure Stainless Steel Grooved Couplings 77A

The stainless steel high pressure coupling is designed for high pressure applications, such as RO and desalination systems. The 77A series is available with strong and anti-corrosive alloys of CF8 (ss304), CF8M (316), CF3M (316L), Duplex CD3MN (2205), super duplex CE8MN, CE3MN (2507). The 77C features 304 / 316 botls and silicone bronze heavy nuts to prevent galling during repetitive use.

Sizes - inches / DN & Operation pressure rating

3/4" to 8" (DN20 to DN200) 1500 psi (105 bar)
10" to 12" (DN250 to DN300) 1200 psi (83 bar) (cut groove only)

Material specification:

Super duplex 2507 (CE3MN) to ASTM A890 Grade 5A
-CE8MN TO ASTM A 890 GRADE 2A
-Duplex 2205 (CD3MN) to ASTM A 890 Grade 4A
-Austenic 254SMO (CK3MCuN) TO A743
-Austenic 904L (CN2MCuN) TO A351
-316 to ASTM A743 CF8M
-316L to ASTM A743 CF3M

Rubber gaskets:
The gasket seal is C-shaped, made of EPDM for cold water, hot water, acid, oil-free air and multiple chemical solution (-50C to 150C).

Bolts: Type SS304 or 316 stainless steel track bolts ASTM A193- B8M

Nuts: Type SS304 or 316 stainless steel nuts ASTM A-193 B-8M
Optional silicone bronze heavy duty nuts to ASTM B98 C65 100.